Improvement in thrashing-machines



LEVI BRONSON.

Improvement in Threshing Machines. N0. 122,354.u "Patented1an.2,1872.

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LEVI BRONSON, 0F BUFFALO, NEW YORK.

IMPROVEMENT IN THRASHING-MACHINES.

Specification forming part of Letters Patent No. 122,354, dated January 2, 1872.

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Nature of the Dwcntion.

My invention consists in horizontally adjusting' the concavesof thrashing-machines nearer to or further from the thrashing-cylinder, and in the means whereby this is accoxnpiished, as hereinafter described.

General Description.

In the drawing, Figure l is a cross-section of the cylinder and concaves.` Fig. 2 is aplan, with the cylinder and concaves removed, showing the adjusting devices.

A is the frame, B B, two curved concave supports or hangers, having horizontal slots a a' in the upper end instead of vertical ones, and connected by arod, b, at the lower end, as shown. This rod projects through .the han gers B B into horizontal slots c c in the side pieces of the frame A, and which run parallel with slots a a in the upper ends of the hangers. C is a drawing-rod, bent at an angle, and secured at either end to the rod b, just inside the hangers, and provided at its point with a screw-hole, d. e is the moving screw, which passes-through this hole d, and also through cross-piece D of the frame A, and is held therein by a collar, &c., as shown in Fig. l. A wrench or crank, f, or its equivalent, operates the screw from the outside. E is the cylinder, and F the front grateor front portion of the feed-board, which moves with the concaves. The slots a a have pins g, upon which they slide. It will readily be seen that by merely turning the wrench f the concave will be moved horizontally forward or backward. The

` main object in moving them in this way instead of up and down is to widen the space at or near the feed-board, while the space at the bottom and exit part is kept the same. This facilitates feeding, as some kinds of grain need the teeth of the concave and thrashing cylinder closer together than others.

It is common to raise the concaves of thrashmore difficult; while by my invention vof the horizontal movement the space between the Vconcaves and thrashing-cylinder is not varied at the lowerv edge, as before stated, but the feeding-entrance is widened to facilitate feeding. V1n the old method of adjusting up and down, the front grate attached to the'concaves is raised up with them, making a steeper incline, and the wooden feed-board which rests on the edge of the front grate is attened in position, the break making a short angle to feed over, which, with some kinds of grain, is j quite detrimental. By my horizontal movement of the conca-ves the line of the front grate and feedboard remain always at the same angle which is an important consideration, as it is alwaysdesirable to keep the original angle, which is set for all kinds of grain. The adjusting can be done'by the party feeding the machine, either with his footor hand without getting olf, the crank or handle being just beneath him. In the other methods the adjustment is from the side, and has to Vbe attended to by another party. j

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is 1 1. The combination of the concave supports B B', horizontal slot-s a a' and c c', rod b, and studs g, all arranged and operating in connection with the drawingor adjusting-rod C and thrashing-cylinder E, as herein shown, whereby a horizontal adjustment of the concaves to or`from the thrashing-cylinder is secured.

2. The drawing-rod C, screw-hole d, screw e, and handlej', in combination with the rod b, grate F, curved concaves B B', horizontal slots a a and c c', studs g g, and thrashing-cylinder E, all constructed, arranged, and operating substantially 'as and for the purpose set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

LEVI BRON SON. Witnesses:

J. R. BRAKE,

C. N. WooDwARD. (159) 

